/**
 * jQuery Roundabout - v1.0
 * http://fredhq.com/projects/roundabout/
 *
 * Moves list-items of enabled ordered and unordered lists long
 * a chosen path. Includes the default "lazySusan" path, that
 * moves items long a spinning turntable.
 *
 * Terms of Use // jQuery Roundabout
 * 
 * Open source under the BSD license
 *
 * Copyright (c) 2009, Fred LeBlanc
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   - Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the following 
 *     disclaimer in the documentation and/or other materials provided 
 *     with the distribution.
 *   - Neither the name of the author nor the names of its contributors 
 *     may be used to endorse or promote products derived from this 
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 */
// Load the default roundabout shape
jQuery.extend({
	roundabout_shape: {
		def: 'lazySusan',
		lazySusan: function(r, a, t) {
			return {
				x: Math.sin(r + a), 
				y: (Math.sin(r + 3*Math.PI/2 + a) / 8) * t, 
				z: (Math.cos(r + a) + 1) / 2,
				scale: (Math.sin(r + Math.PI/2 + a) / 2) + 0.5
			};
		}
	}
});

// create roundabout
jQuery.fn.roundabout = function() {
	var options = (typeof arguments[0] != 'object') ? {} : arguments[0];

	options = {
		bearing: (typeof options.bearing == 'undefined') ? 0.0 : parseFloat(options.bearing % 360.0, 4),
		tilt: (typeof options.tilt == 'undefined') ? 0.0 : parseFloat(options.tilt, 4),
		minZ: (typeof options.minZ == 'undefined') ? 100 : parseInt(options.minZ, 10),
		maxZ: (typeof options.maxZ == 'undefined') ? 400 : parseInt(options.maxZ, 10),
		minOpacity: (typeof options.minOpacity == 'undefined') ? 0.40 : parseFloat(options.minOpacity, 2),
		maxOpacity: (typeof options.maxOpacity == 'undefined') ? 1.00 : parseFloat(options.maxOpacity, 2),
		minScale: (typeof options.minScale == 'undefined') ? 0.40 : parseFloat(options.minScale, 2),
		maxScale: (typeof options.maxScale == 'undefined') ? 1.00 : parseFloat(options.maxScale, 2),
		duration: (typeof options.duration == 'undefined') ? 600 : parseInt(options.duration, 10),
		btnNext: options.btnNext || null,
		btnPrev: options.btnPrev || null,
		easing: options.easing || 'swing',
		clickToFocus: (options.clickToFocus !== false),
		focusBearing: (typeof options.focusBearing == 'undefined') ? 0.0 : parseFloat(options.focusBearing % 360.0, 4),
		shape: options.shape || 'lazySusan',
		debug: options.debug || false,
		childSelector: options.childSelector || 'li',
		startingChild: (typeof options.startingChild == 'undefined') ? null : parseInt(options.startingChild, 10)
	};

	this.each(function(i) {
		var ref = jQuery(this);
		var childSelector = options.childSelector;
		var children = ref.children(childSelector);
		var period = 360.0 / children.length;
		var startingBearing = (options.startingChild === null) ? options.bearing : options.startingChild * period;

		// set starting attributes
		ref
			.addClass('roundabout-holder')
			.css('padding', 0)
			.css('position', 'relative')
			.css('z-index', options.minZ)
			.attr('bearing', startingBearing)
			.attr('tilt', options.tilt)
			.attr('minZ', options.minZ)
			.attr('maxZ', options.maxZ)
			.attr('minOpacity', options.minOpacity)
			.attr('maxOpacity', options.maxOpacity)
			.attr('minScale', options.minScale)
			.attr('maxScale', options.maxScale)
			.attr('duration', options.duration)
			.attr('easing', options.easing)
			.attr('clickToFocus', options.clickToFocus)
			.attr('focusBearing', options.focusBearing)
			.attr('animating', '0')
			.attr('childInFocus', -1)
			.attr('shape', options.shape)
			.attr('period', period)
			.attr('debug', options.debug)
			.attr('childSelector', options.childSelector);

		children.each(function(i) {
			var degrees = period * i;
			var startPos;

			// apply classes and css first
			jQuery(this)
				.addClass('roundabout-moveable-item')
				.css('position', 'absolute')
				.attr('degrees', degrees);
			
			// then measure
			startPos = [
				jQuery(this).width(),
				jQuery(this).height(),
				parseInt(jQuery(this).css('font-size'), 10)
			];
			
			jQuery(this)
				.attr('startPos', startPos.join(','));

			// bind click events
			if (options.clickToFocus === true) {
				jQuery(this).click(function(e) {
					if (!jQuery.roundabout_isInFocus(ref, degrees)) {
						e.preventDefault();
						if (ref.attr('animating') == '0') {
							ref.roundabout_animateAngleToFocus(degrees);
						}
						return false;
					}
				});
			}
		});

		// bind buttons
		if (options.btnNext) {
			jQuery(options.btnNext).click(function(e) {
				e.preventDefault();
				if (ref.attr('animating') == '0') {
					ref.roundabout_animateToNextChild();
				}
				return false;
			});
		}

		if (options.btnPrev) {
			jQuery(options.btnPrev).click(function(e) {
				e.preventDefault();
				if (ref.attr('animating') == '0') {
					ref.roundabout_animateToPreviousChild();
				}
				return false;
			});
		}

		ref.roundabout_updateChildPositions();		
	});
	return this;
};

jQuery.fn.roundabout_setTilt = function(newTilt) {
	this.each(function(i) {
		jQuery(this).attr('tilt', newTilt);
		jQuery(this).roundabout_updateChildPositions();
	});
	return this;
};

jQuery.fn.roundabout_setBearing = function(newBearing) {
	this.each(function(i) {
		jQuery(this).attr('bearing', parseFloat(newBearing % 360, 4));	
		jQuery(this).roundabout_updateChildPositions();
	});

	if (typeof arguments[1] === 'function') {
		var callback = arguments[1];
		setTimeout(function() { callback(); }, 0);
	}
	
	return this;
};

jQuery.fn.roundabout_adjustBearing = function(delta) {
	delta = parseFloat(delta, 4);
	if (delta !== 0) {
		this.each(function(i) {
			jQuery(this).attr('bearing', jQuery.roundabout_getBearing(jQuery(this)) + delta);
			jQuery(this).roundabout_updateChildPositions();
		});
	}
	return this;
};

jQuery.fn.roundabout_adjustTilt = function(delta) {
	delta = parseFloat(delta, 4);
	this.each(function(i) {
		jQuery(this).attr('tilt', parseFloat(jQuery(this).attr('tilt'), 4) + delta);
		jQuery(this).roundabout_updateChildPositions();
	});
	return this;
};

jQuery.fn.roundabout_animateToBearing = function(bearing) {
	bearing = parseFloat(bearing, 4);
	var currentTime = new Date();
	var data = (typeof arguments[3] !== 'object') ? null : arguments[3];
	var duration = (typeof arguments[1] == 'undefined') ? null : arguments[1];
	var easingType = (typeof arguments[2] != 'undefined') ? arguments[2] : null;

	this.each(function(i) {
		var ref = jQuery(this), timer, easingFn, newBearing;
		var thisDuration = (duration === null) ? parseInt(ref.attr('duration'), 10) : duration;
		var thisEasingType = (easingType !== null) ? easingType : ref.attr('easing') || 'swing';

		if (data === null) {
			data = {
				timerStart: currentTime,
				start: jQuery.roundabout_getBearing(ref),
				totalTime: thisDuration
			};
		}
		timer = currentTime - data.timerStart;

		if (timer < thisDuration) {		
			ref.attr('animating', '1');
			
			if (typeof jQuery.easing.def == 'string') {
				easingFn = jQuery.easing[thisEasingType] || jQuery.easing[jQuery.easing.def];
				newBearing = easingFn(null, timer, data.start, bearing - data.start, data.totalTime);
			} else {
				newBearing = jQuery.easing[thisEasingType]((timer / data.totalTime), timer, data.start, bearing - data.start, data.totalTime);
			}
			
			ref.roundabout_setBearing(newBearing, function() { ref.roundabout_animateToBearing(bearing, thisDuration, thisEasingType, data); });
		} else {
			bearing = (bearing < 0) ? bearing + 360 : bearing % 360;
			ref.attr('animating', '0');
			ref.roundabout_setBearing(bearing);
		}
	});	
	return this;
};

// animation
jQuery.fn.roundabout_animateToDelta = function(delta) {
	var duration, easing;
	
	if (typeof arguments[1] !== 'undefined') {
		duration = arguments[1];
	}
	
	if (typeof arguments[2] !== 'undefined') {
		easing = arguments[2];
	}
	
	this.each(function(i) {
		delta = jQuery.roundabout_getBearing(jQuery(this)) + delta;	
		jQuery(this).roundabout_animateToBearing(delta, duration, easing);
	});
	return this;
};

jQuery.fn.roundabout_animateToChild = function(childPos) {	
	var duration, easing;
	
	if (typeof arguments[1] !== 'undefined') {
		duration = arguments[1];
	}
	
	if (typeof arguments[2] !== 'undefined') {
		easing = arguments[2];
	}
	
	this.each(function(i) {
		var ref = jQuery(this);
		if (parseInt(ref.attr('childInFocus'), 10) !== childPos && ref.attr('animating', '0')) {		
			var child = jQuery(ref.children(ref.attr('childSelector'))[childPos]);
			ref.roundabout_animateAngleToFocus(parseFloat(child.attr('degrees'), 4), duration, easing);
		}
	});
	return this;
};

jQuery.fn.roundabout_animateToNextChild = function() {
	var duration, easing;
	
	if (typeof arguments[0] !== 'undefined') {
		duration = arguments[0];
	}
	
	if (typeof arguments[1] !== 'undefined') {
		easing = arguments[1];
	}
	
	this.each(function(i) {
		if (jQuery(this).attr('animating', '0')) {
			var bearing = 360.0 - jQuery.roundabout_getBearing(jQuery(this));
			var period = parseFloat(jQuery(this).attr('period'), 4), j = 0, range;
		
			while (true) {
				range = { lower: period * j, upper: period * (j + 1) };
				if (bearing <= range.upper && bearing > range.lower) {
					jQuery(this).roundabout_animateToDelta(bearing - range.lower, duration, easing);
					break;
				}
				j++;
			}
		}
	});
	return this;
};

jQuery.fn.roundabout_animateToPreviousChild = function() {
	var duration, easing;
	
	if (typeof arguments[0] !== 'undefined') {
		duration = arguments[0];
	}
	
	if (typeof arguments[1] !== 'undefined') {
		easing = arguments[1];
	}
	
	this.each(function(i) {
		if (jQuery(this).attr('animating', '0')) {
			var bearing = 360.0 - jQuery.roundabout_getBearing(jQuery(this));
			var period = parseFloat(jQuery(this).attr('period'), 4), j = 0, range;
		
			while (true) {
				range = { lower: period * j, upper: period * (j + 1) };
				if (bearing >= range.lower && bearing < range.upper) {
					jQuery(this).roundabout_animateToDelta(bearing - range.upper, duration, easing);
					break;
				}
				j++;
			}
		}
	});
	return this;
};

// moves a given angle to the focus by the shortest means possible
jQuery.fn.roundabout_animateAngleToFocus = function(target) {
	var duration, easing;
	
	if (typeof arguments[1] !== 'undefined') {
		duration = arguments[1];
	}
	
	if (typeof arguments[2] !== 'undefined') {
		easing = arguments[2];
	}
	
	this.each(function(i) {
		var delta = jQuery.roundabout_getBearing(jQuery(this)) - target;
		delta = (Math.abs(360.0 - delta) < Math.abs(0.0 - delta)) ? 360.0 - delta : 0.0 - delta;
		delta = (delta > 180) ? -(360.0 - delta) : delta;
		
		if (delta !== 0) {
			jQuery(this).roundabout_animateToDelta(delta, duration, easing);	
		}
	});
	return this;
};

jQuery.fn.roundabout_updateChildPositions = function() {
	this.each(function(i) {
		var ref = jQuery(this);
		var inFocus = -1;
		var data = {
			bearing: jQuery.roundabout_getBearing(ref),
			tilt: parseFloat(ref.attr('tilt'), 4),
			stage: { width: Math.floor(ref.width() * 0.9), height: Math.floor(ref.height() * 0.9) },
			animating: ref.attr('animating'),
			inFocus: parseInt(ref.attr('childInFocus'), 10),
			focusBearingRad: jQuery.roundabout_degToRad(parseFloat(ref.attr('focusBearing'), 4)),
			shape: jQuery.roundabout_shape[ref.attr('shape')] || jQuery.roundabout_shape[jQuery.roundabout_shape.def]
		};
		data.midStage = { width: data.stage.width / 2, height: data.stage.height / 2 };
		data.nudge = { width: data.midStage.width + data.stage.width * 0.05, height: data.midStage.height + data.stage.height * 0.05 };
		data.zValues = { min: parseInt(ref.attr('minZ'), 10), max: parseInt(ref.attr('maxZ'), 10) };
		data.zValues.diff = data.zValues.max - data.zValues.min;
		data.opacity = { min: parseFloat(ref.attr('minOpacity'), 2), max: parseFloat(ref.attr('maxOpacity'), 2) };
		data.opacity.diff = data.opacity.max - data.opacity.min;
		data.scale = { min: parseFloat(ref.attr('minScale'), 2), max: parseFloat(ref.attr('maxScale'), 2) };
		data.scale.diff = data.scale.max - data.scale.min;

		// update child positions
		ref.children(ref.attr('childSelector')).each(function(i) {
			if (jQuery.roundabout_updateChildPosition(jQuery(this), ref, data, i) && data.animating == '0') {
				inFocus = i;
				jQuery(this).addClass('roundabout-in-focus');
			} else {
				jQuery(this).removeClass('roundabout-in-focus');
			}
		});

		// update status of who is in focus
		if (inFocus !== data.inFocus) {
			jQuery.roundabout_triggerEvent(ref, data.inFocus, 'blur');

			if (inFocus !== -1) {
				jQuery.roundabout_triggerEvent(ref, inFocus, 'focus');
			}

			ref.attr('childInFocus', inFocus);
		}
	});	
	return this;	
};

//----------------

jQuery.roundabout_getBearing = function(el) {
	return parseFloat(el.attr('bearing'), 4) % 360;
};

jQuery.roundabout_degToRad = function(degrees) {
	return (degrees % 360.0) * Math.PI / 180.0;
};

jQuery.roundabout_isInFocus = function(el, target) {
	return (jQuery.roundabout_getBearing(el) % 360 === (target % 360));
};

jQuery.roundabout_triggerEvent = function(el, child, eventType) {
	return (child < 0) ? this : jQuery(el.children(el.attr('childSelector'))[child]).trigger(eventType);
};

jQuery.roundabout_updateChildPosition = function(child, container, data, childPos) {
	var ref = jQuery(child), out = [];
	var startPos = ref.attr('startPos').split(',');
	var itemData = {
		startWidth: startPos[0],
		startHeight: startPos[1],
		startFontSize: startPos[2],
		degrees: parseFloat(ref.attr('degrees'), 4)
	};
	var rad = jQuery.roundabout_degToRad((360.0 - itemData.degrees) + data.bearing);
	
	// adjust radians to be between 0 and Math.PI * 2
	while (rad < 0) {
		rad = rad + Math.PI * 2;
	}
	while (rad > Math.PI * 2) {
		rad = rad - Math.PI * 2;
	}
	
	var factors = data.shape(rad, data.focusBearingRad, data.tilt); // obj with x, y, z, and scale values

	// correct
	factors.scale = (factors.scale > 1) ? 1 : factors.scale;
	factors.adjustedScale = (data.scale.min + (data.scale.diff * factors.scale)).toFixed(4);
	factors.width = factors.adjustedScale * itemData.startWidth;
	factors.height = factors.adjustedScale * itemData.startHeight;
	
	// alter item
	ref
		.css('left', ((factors.x * data.midStage.width + data.nudge.width) - factors.width / 2.0).toFixed(2) + 'px')
		.css('top', ((factors.y * data.midStage.height + data.nudge.height) - factors.height / 2.0).toFixed(2) + 'px')
		.css('width', factors.width.toFixed(2) + 'px')
		.css('height', factors.height.toFixed(2) + 'px')
		.css('opacity', (data.opacity.min + (data.opacity.diff * factors.scale)).toFixed(2))
		.css('z-index', parseInt(data.zValues.min + (data.zValues.diff * factors.z), 10))
		.css('font-size', (factors.adjustedScale * itemData.startFontSize).toFixed(2) + 'px')
		.attr('current-scale', factors.adjustedScale);
	
	if (container.attr('debug') == 'true') {
		out.push('<div style="font-weight: normal; font-size: 10px; padding: 2px; width: ' + ref.css('width') + '; background-color: #ffc;">');
		out.push('<strong style="font-size: 12px; white-space: nowrap;">Child ' + childPos + '</strong><br />');
		out.push('<strong>left:</strong> ' + ref.css('left') + '<br /><strong>top:</strong> ' + ref.css('top') + '<br />');
		out.push('<strong>width:</strong> ' + ref.css('width') + '<br /><strong>opacity:</strong> ' + ref.css('opacity') + '<br />');
		out.push('<strong>z-index:</strong> ' + ref.css('z-index') + '<br /><strong>font-size:</strong> ' + ref.css('font-size') + '<br />');
		out.push('<strong>scale:</strong> ' + ref.attr('current-scale'));
		out.push('</div>');
		
		ref.html(out.join(''));
	}

	return jQuery.roundabout_isInFocus(container, itemData.degrees);
};